think the head gasket junk..what do you think.

[Starflight]

Re: think the head gasket junk..what do you think.

If I didnt know better(you didnt mention), I'd say that head gasket is for a AQ130.
I just had the head on my AQ130 off for some exaust porting(was quite restrictive behind the valve)and hardened valve seats installed as well as valve stem seals installed. I had to install the head twice.(never enough time to do it right the 1st time, but always enough time to do it twice ) I found that the head bolts were too thin to alighn the head and gasket. They allowed for a 1/8 of an inch lateral movement before you torque the bolts down. I later found that volvo made a kit that had bolts w/o heads that you inserted into the block in the opposite corners of the deck to alighn everything. The head and block dont have dowel pins to alighn the head and gasket.
Before I installed things correctly, it had low compression on cyl's2 and 4, and also had alot of blow by because compression was lost to the crankcase, and burned and leaked oil. Idleing was also a problem. After I made bolts to alighn everything, all was well. I also picked up 500 rpm on a new prop that kept me from getting to the proper rpm at wot (was over loading engine)before the head work was done. Now it hits 5100 at wot w/ a 14x19 on a 17' trihull. The original prop was a 14x17 that would hit 5200 before head work.
My head also had a crack between valves on #2 that was repaired.
Are you sure the gasket and head were alighned properly when it was replaced?

 

[revherup]

Re: think the head gasket junk..what do you think.

did a compression test today and the number one cylinder was 30psi all the rest was at 135psi...do you think i should still do that leak down test before i go ahead and pull motor..could it be that the head gasket was not put on right..because i have a medium amount of blow buy...and still dont like low rpm but a lot better then before the new head gasket... thanks for all the input..

 

[Don S]

Re: think the head gasket junk..what do you think.

why would it still have good compresion then and not smoke out the exaust

That is what you said in reply #17, now you have 30psi.
Guess now it's time to do a leakdown test and find out what it is. Or pull it apart and hope for the best AGAIN.

 

[revherup]

Re: think the head gasket junk..what do you think.

i read how to do it but iam still trying to figure out how do you know if its rings or something else i have never done one before,,

 

[jedimaster]

Re: think the head gasket junk..what do you think.

Basically you shoot compressed air into the cylinder through the sparkplug hole. rotate the engine so it is on the compresion stroke for that cylinder(Both valves closed)
and blast it with air.
If more air comes out of the dipstick you need rings, if more air goes out the exhuast you need exhaust valves.
if air comes out of the carb you need intake valves.
If air goes into the cooling system you could have a cracked block or blown head gasket.
Correct me if I am wrong but off the top of my head I think thats what you do to find out.